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34 lines
1.2 KiB
Racket
34 lines
1.2 KiB
Racket
9 years ago
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#lang racket/base
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(require (for-syntax racket/base syntax/parse) syntax/strip-context)
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(provide (all-defined-out) (all-from-out syntax/strip-context))
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(define-syntax (syntax-match stx)
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(syntax-case stx (syntax)
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[(_ stx-arg [(syntax pattern) body ...] ...)
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#'(syntax-case stx-arg ()
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[pattern body ...] ...)]))
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(define-syntax (add-syntax stx)
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;; todo: permit mixing of two-arg and one-arg binding forms
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;; one-arg form allows you to inject an existing syntax object using its current name
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(syntax-case stx (syntax)
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[(_ ([(syntax sid) sid-stx] ...) body ...)
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#'(with-syntax ([sid sid-stx] ...) body ...)]
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;; todo: limit `sid` to be an identifier
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[(_ ([sid] ...) body ...)
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#'(with-syntax ([sid sid] ...) body ...)]))
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(define-syntax syntax-let (make-rename-transformer #'add-syntax))
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(define-syntax inject-syntax (make-rename-transformer #'add-syntax))
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(define-syntax (map-syntax stx)
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(syntax-case stx ()
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[(_ <proc> <arg> ...)
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#'(map <proc> (if (and (syntax? <arg>) (list? (syntax-e <arg>)))
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(syntax->list <arg>)
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<arg>) ...)]))
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#;(define-syntax syntax-variable (make-rename-transformer #'format-id))
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